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Debt (Tables)
 3 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Schedule of Debt
The carrying values of the components of the 2014 Notes and 2019 Notes are as follows (in thousands):
March 31, 2022December 31, 2021
  2.75% 2014 Notes due 2034
Principal amount$578 $578 
Unamortized debt discount(8)(8)
Unamortized debt issuance cost(2)(2)
Net carrying value of 2014 Notes
$568 $568 
  5.25% 2019 Notes due 2024
Principal amount $55,000 $55,000 
Unamortized debt issuance cost(1,297)(1,408)
Net carrying value of 2019 Notes$53,703 $53,592 
Net carrying value of all Notes$54,271 $54,160 
The carrying values of our term loan and advances under the Credit Facility, and the maximum amount available under the Credit Facility are as follows (in thousands):
 March 31, 2022December 31, 2021
  Term Loan
Principal amount$10,000 $10,000 
End of term fee accretion133 79 
Unamortized debt issuance cost(27)(30)
Net carrying value of term loan$10,106 $10,049 
  Revolving Credit Facility
Carrying value of advances under credit agreement$— $6,838 
The following table summarizes the par value, carrying value and the estimated fair value of our debt as of March 31, 2022 and December 31, 2021, respectively (in thousands):
March 31, 2022December 31, 2021
Par ValueCarrying ValueFair ValuePar ValueCarrying ValueFair Value
Bridge Loans$25,000 $35,655 $35,655 $— $— $— 
Convertible Notes:
2014 Notes$578 $568 $601 $578 $568 $601 
2019 Notes55,000 53,703 74,998 55,000 53,592 81,880 
Total Notes$55,578 $54,271 $75,599 $55,578 $54,160 $82,481 
Term loan, net$10,000 $10,106 $9,796 $10,000 $10,049 $10,113 
Advances under revolving credit agreement$— $— $— $6,838 $6,838 $6,838 
Total debt$90,578 $100,032 $121,050 $72,416 $71,047 $99,432